I have an MSI h81m-p33 motherboard. USED off eBay and the thing won't accept a boot USB, when I try to change the boot priority in BIOS, the BIOS if screwed. As in the BIOS menu is stripped out, glitched and won't let me go into settings because the BIN file is incorrect. And I can't flash it since I'd need to be able to go into settings for that. Any ideas?